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Sunday, 20 june 2010

Si totusi se-nvarte !

Proposed by catanedelcuOffline
(16 comments)5.119 times displayed

Avem o roata , banala , ca toate rotile ,pe care o rotim odata astfel punctele marcate pe ea se translateaza pe liniile din imagine asa ca A -> A' si B->B'  nimic anormal.  

Totusi A a parcurs o lungime egala cu lungimea cercului mare  L = 2 PI R    pe cand  B a parcurs dupa cum se vede clar , lungimea cercului de raza  l = 2 PI r   da' e evident  ca L = l  si ajungem la alte "bazaconii"  gen R=r .

Daca o tinem tot asa demonstram ca orice doua segmente sunt egale  ? Cum vine asta ?  :)


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